Grinding mill



Feb. 20, 1934. E VAN PELT I 1,947, 505

GRINDING MILL Filed March 23, 1931 2 Sheets-Sheet l.

. VINVENTOR.

A TTORNEYS.

Feb. 20, 1934. E. L. VAN ELT GRINDING MILL 2 Sheets-Sheet 2 Filed March 23, 1931 /o^ za I I/III f JE I INVENTOR.

ATTORNEYS.

Patenta& Feb; 20, 1934 UNITED. .STATES GRINDING MILL Elmer L. Van Pelt, Denver, Colo., assignor to American Ball Mill Company, Denver, Colo.

Application March 23, 1931. Seriai No. 524549 3 Clams.

This invention relates to sectional structures and more particularly to looking means for fastening the sections together.

It is an object of the invention to provide a,

5 looking means easily applied and permitting oi the removal of any one section of a structure separately and without disturbing the other sections. i

Another object is to provide a looking device which is adjustable to compensate forexpansion and'contraction of the material of which the sections are composed and which will resist defiection and deformation of the parts to which it is applied.

The invention is particularly adapted for use in connection with linings of ball mills and further objects residein providing in cooperation with the looking devices, holding means upon which the sections are assembled and which relieve the sections of much of the stresses to which they are subject in the operation of the' mili.

Other objects reside principally in novel details of constructon and in--novel combinations and arrangements of parts as will be brought out in the course of the following description.

In the accompanying drawings in the several views of which like parts are similarly designated, v 4

Figure 1 represents a partially sectional side elevation of a ball mill equipped with a seetional lining constructed in accordance with the present invention,

Figure 2, an enlarged plan view of a portion of the lining,

Figur-e 3, `a further enlarged section 3-3. Figure 2,

l Figure 4, a section along the line 4-4, Figure 2, 4

Figure 5, a sectional elevation showing the appiication' o! the looking device t"o a flat sectional structure,

Figure 6, a section taken on the line 6-6, Figure 5,

Figure 7, a side view of 'one of the sections, showing a modification of the wedge-shaped key forming a part of the looking device,

Figure 8, a fragmentary section through two adjoining sections showing another modification of the key, 4 x

figure 9, a similar sectional view in which the sections of the structure are of modified construction, and

Figura 10.a section along the line 10-10,

Referrins first to Figur-ee to 4 oi the draw- Figur-e 9.

on the line` ings, the ball mill 5 is composed of a cylindrical shell 6 closed at its ends by heads 7 and mounted for rotation on standards 8. A gear wheel 9 exteriorly of the shell, provides means for its rotation by connection with a conveniently located driving element. j

'The lining of the shell is composed of sections 10 assembled in rows lengthwise of the shell, upon girders 12. The girders are of channel form and they are welded in an inverted position upon the interier surface of the shell as at 13. The grders extending 'lengthwise of the mill, are equidistantly spaced and they provide saddles for the sections of the lining which are flanged to 'straddle the same.

The flanges of the sections fit snugly upon the sides of the girders but their inner surfaces diverge to facilitate placement of the sections upon the girders and to permit of a certain degree of selfadjustment. When the sections are in place upon the girders, their sides are substantially parallel and spaced from each other; Each section has upon its upper surface, a longitudinal boss 14 which in conjunction with similar bosses of the other sections in the row provide lifters which in' the operation of the mili lift and drop the material in a, cascading movement.

The sections have in their spaced sides curved grooves 15 of tapering depth, the ends of which open at the top of the sections. Wedge-shaped, curved keys 16 driven into the grooves of opposite sections constitute the looking' means which fasten the sections in place upon the girders.

The ends of the curved keys may project above. the surfaces of the sections and ifthe keys are' made of ductile material, their ends may be clinched upon said surfaces to hold the keys against longitudinal displacement. In any case, the projecting ends are not objectionable in the operation of the ball'mill and if the ends are worn away, the keys will still perform their function as before. 4

In. fact, the sections may wear to their girders without disturbing the position of the keys since a portion thereof is below the surface of the girders upon which the sections are seated, as best shown in Figures 3 and 4. It will be apparent that when the wedge-shaped curved keys are driven into the correspondingly shaped key ways formed by the opposed grooves of slanting depth. in the sides of the sections, these sections are flrmly driven against the edges of the girders upon which they are seated and thereby are locked in place.

When a section breaks or becomes worn it is easily removed without disturbing adjoining sections by driving the keys out ot the grooves of the' section and the worn or broken section is readily replaced by another to be fastened in place' by means of the keys as before.

The girders upon which the sections are assembled receive most of the impact of the grlnding bodies and the material in the operation 'of the e girders provide a shell construction which is simple, strong, durable and easily repaired and the keys, owing to their curved form, resisttdeflection and, moreover', compensate for expansion and contraction of the sections.

It is possible to make the keys of pliable material and-straight, in which case they will assume the curvilinear form of the key-ways when driven thereonto, as has been illustrated at 17 in Figure 7. v

The keys may also be made of single or double' dove-tailed section to aid in looking the sections against lateral displacement, as has been shown at 18 in Figura 8.. This form of the keys is of special nature where the sections are mounte without-the girders shown in Figure 3.

The sections may be modified by omitting the curved grooves and substituting therefor curved flanges 19 of tapering width, to be engaged by the correspondingly formed keys, as illustrated in Figures 9 and 10. In this form of the invention,

the keys engage upon the surface upon which the keys are supported either directly or through the intermediary of girders or similar devices.

In Figures 5 and 6, the looking means are ap 'plied to sections 20 of a flat structure, such as a,

paving' or tiling. In this' illustration, the girders have been omitted, and the sections are held in place by other means', such as abutments at the edges of the structure;

Having thus described my invention; it will be understood that other modiflcations and changes I in Construction may be made without departing an opening at the inner surface of the lining, and

curved keys in the key-ways, extending continuously between the openings of the same 3. In asetional'structure, spaced sections having curved grooves of tapering depth, forming complementary parts of a wedge-shaped keyway, and having openings in a surface of the sections, and a curved wdge-shaped key in the keyof the same.

- ELMER L, VAN PELT.`

way, extending continuously between the openings 

